1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
index 1784b8077a1..9898fb01edf 100644
--- a/arch/x86/kernel/tsc_64.c
+++ b/arch/x86/kernel/tsc_64.c
@@ -242,7 +242,7 @@ void __init tsc_calibrate(void)
         if (hpet) {
                 printk(KERN_INFO "TSC calibrated against HPET\n");
                 if (hpet2 < hpet1)
-                        hpet2 += 0x100000000;
+                        hpet2 += 0x100000000UL;
                 hpet2 -= hpet1;
                 tsc1 = (hpet2 * hpet_readl(HPET_PERIOD)) / 1000000;
         } else {